For Each row In DataGridView1.Rows
If DataGridView1.Rows = DataGridView2.Rows Then
Datagridview1.checkBoxColumn.value = True
End If
Next
'Sample Code Only

I hope you get my point TY for the Future Help

I fix it and thanks for the Help
here is the answer

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
For Each row In Me.DataGridView1.Rows
For Each row1 In Me.DataGridView2.Rows
If row.Cells(2).Value.ToString() = (row1.cells(0).Value.ToString()) Then
row.cells(0).value = True
End If
Next
Next